65000081 has 2 divisors, whose sum is σ = 65000082. Its totient is φ = 65000080.

The previous prime is 65000071. The next prime is 65000119. The reversal of 65000081 is 18000056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 36481 = 8060^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 65000081 - 2¹⁴ = 64983697 is a prime.

It is a super-2 number, since 2×65000081² = 8450021060013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32500040 + 32500041.

It is an arithmetic number, because the mean of its divisors is an integer number (32500041).

Almost surely, 2^65000081 is an apocalyptic number.

It is an amenable number.

65000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

65000081 is an equidigital number, since it uses as much as digits as its factorization.

65000081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 65000081 is about 8062.2627717037. The cubic root of 65000081 is about 402.0727428736.

The spelling of 65000081 in words is "sixty-five million, eighty-one", and thus it is an aban number and an uban number.